When a person is receiving head from someone and their girlfriend or boyfriend calls them and to not get caught in the act they put them on speakerphone and carry on a normal conversation as if nothing is going on.

Jack: I was watching a movie with Jill and then she started to give me some brain and in the middle of it Sue, my girlfriend called.

Bob: What did you do?

Jack: I just put Sue on speakerphone and talked to her while Jill gave me the best brain ever.